Flow rate control device for supplying liquid chemical

ABSTRACT

Provided is a flow rate control device for supplying liquid chemicals. The device according to an embodiment of the present disclosure includes a housing unit which is placed at the location from which liquid chemicals are supplied and comprises an inflow conduit on one side to which the liquid chemicals flow in and an outflow conduit from which the flowed-in liquid chemicals whose flow rate is controlled flow out; and a control unit which is integrated with the housing unit and comprises an inflow space which comes in contact with an inflow hole at a terminal portion of the inflow conduit, an outflow space which comes in contact with an outflow hole at a terminal portion of the outflow conduit and a control path which is connected between the inflow space and the outflow space to control the flow rate of the flowed-in liquid chemicals, wherein the control path has a controlled inner diameter and a controlled length according to the flow rate a user aims at.

BACKGROUND 1. Technical Field

The present disclosure relates to a flow rate control device forsupplying liquid chemicals, more particularly a flow rate control devicefor liquid chemicals which enhances flow rate control efficiency byimproving the structure which controls the flow rate of liquid chemicalswhen the liquid chemicals are supplied, thereby minimizing theinstallation area and by extending the diameter of a flow path accordingto flow rate controls, thereby minimizing obstruction in the flow pathby particles as foreign object.

2. Description of Related Art

Generally, a patient cannot take in food due to problems of theirdigestive functions and is injected through their blood vessels withnecessary nutrients such as glucose. Various liquid chemicals such asantitumor agents, antibiotics, analgesics and the like are also injectedinto such patients through their blood vessels for treating theirdiseases.

Here, it is desirable to inject such nutrients and/or liquid chemicalsthrough their blood vessels in accurate supply quantities and accordingto predetermined flow rates depending on the state of the patient.

In particular, antibiotics to be administered to critically ill patientswho suffer from cancer, leukemia and the like, different from ordinaryliquid chemicals, should be supplied, taking into account the nature ofsuch medicine, in infinitesimal quantities at a steady rate. Likewise,analgesics to be administered to patients who suffer from persistentpain after surgery to mitigate the pain should be supplied inappropriate quantities at an identical interval.

Such critically ill patients can experience abnormal symptoms such asshock, temporary hypertension, vessel wall damage and the like when theyundergo a change in the liquid chemicals they are injected with in termsof supply quantities or flow rates which lead to the interval ofadministration.

Therefore, such a flow rate control device for controlling the flow rateof the supplied liquid chemicals, thereby preventing any change in theflow rate is installed and used at the location to which such chemicalsare supplied.

Such a flow rate control device for supplying liquid chemicals accordingto an existing technology is installed at the location to which suchchemicals are supplied. Such a flow rate control device has capillarytubes with a fine diameter and a length for achieving a predeterminedflow rate and installed at the location to which liquid chemicals passthrough so that the liquid chemicals, whose flow rates are controlledwhen the chemicals pass through the capillary tubes, are supplied.

As described thus far, the flow rate control device for supplying liquidchemicals according to an existing technology controls its flow rate byflowing the liquid chemicals through a plurality of the fine capillarytube. The length of the capillary tubes of such a flow rate controldevice is determined according to the degree of the flow rate. It isdifficult to manufacture such capillary tubes since the capillary tubesshould have an infinitesimal hole with high degree of linearity so as tominimize any change in flow rates. Furthermore, since such holes have aninfinitesimal diameter, there is a limit to extending the length of thecapillary according to decrease in flow rates.

Even after being filtered with an appropriate filter, liquid chemicalswhich react with each other can produce particles as foreign object iftemperature changes and time for administration is extended. Since theflow rate control device for supplying liquid chemicals according to anexisting technology has the capillary tubes having an infinitesimalhole, such produced particles can obstruct the hole when they attempt topass through the hole making supply of the liquid chemicals stop, whichrequires frequent inspection and replacement.

SUMMARY

To resolve the problems, the present disclosure provides the flow ratecontrol device for supplying liquid chemicals which enhances flow ratecontrol efficiency by improving the structure which controls the flowrate of liquid chemicals when the liquid chemicals are supplied, therebyminimizing the installation area and by extending the diameter of a flowpath according to flow rate controls, thereby minimizing obstruction inthe flow path by particles as foreign object.

The present disclosure is not limited to the objectives described above.Other undescribed objectives should be understandable in the followingdescription.

To achieve the objectives, the present disclosure provides the flow ratecontrol device for supplying liquid chemicals including:

a housing unit which is placed at the location from which liquidchemicals are supplied and includes an inflow conduit on one side towhich the liquid chemicals flow in and an outflow conduit from which theflowed-in liquid chemicals whose flow rate is controlled flow out;and a control unit which is integrated with the housing unit andincludes an inflow space which comes in contact with an inflow hole at aterminal portion of the inflow conduit, an outflow space which comes incontact with an outflow hole at a terminal portion of the outflowconduit and a control path which is connected between the inflow spaceand the outflow space to control the flow rate of the flowed-in liquidchemicals, wherein the control path has a controlled inner diameter anda controlled length according to the flow rate a user aims at.

The housing unit can further include an insertion protrusion whichprotrudes from one side so that the housing unit is fastened to thecontrol unit, has a control space in which the control path of thecontrol unit is inserted and has a leak prevention groove on anotherside which assumes the shape of a groove and is inserted into thecontrol unit so that hermeticity is maintained.

The control unit can include: a control frame having a housing acceptinggroove along the outer circumference around the control path, whichassumes the shape of a groove, into which the protruding portion of thehousing unit is inserted so that the housing unit is secured in order toprevent the liquid chemicals supplied via the control path from beingleaked; and a leak prevention protuberance which protrudes from insidethe housing accepting groove and is inserted into and integrated withthe housing unit in order to prevent the liquid chemicals through thecontrol path from being leaked outside.

The control path can be arranged so that the inflow hole and the outflowhole are connected thereto and placed in a zigzag pattern so that theflow path having a predesigned diameter for the flowed-in liquidchemicals to flow at a prespecified flow rate is formed up to apredesigned length.

Inside the control frame, the inflow space to which the liquid chemicalsflow in from the housing unit can be formed; the control path is formedfrom the inflow space via an inflow transport path in a zigzag way tocontrol flow rates; and the outflow space is formed off which the liquidchemicals flow out to the housing unit from the control path via anoutflow transport path.

The flow rate control device for supplying liquid chemicals can furtherinclude inflow staining protuberances which protrude at a plurality ofsites so that a plurality of inflow passing paths are formed inside theinflow transport path at a predetermined interval and filter particlescontained in the liquid chemicals transported from the inflow transportpath in order to remove the particles.

The flow rate control device for supplying liquid chemicals can furtherinclude outflow straining protuberances which protrude at a plurality ofsites so that a plurality of outflow passing paths are formed inside theoutflow transport path at a predetermined interval and filter particlescontained in the liquid chemicals transported from the outflow transportpath in order to remove the particles.

Meanwhile, another embodiment of the present disclosure provides theflow rate control device for supplying liquid chemicals including: thehousing unit which is placed at the location from which the liquidchemicals are supplied and has the inflow conduit on one side to whichthe liquid chemicals flow in and the outflow conduit from which theflowed-in liquid chemicals whose flow rate is controlled flow out; aflow rate control unit which is integrated with the housing unit andincludes a control inflow space which comes in contact with the inflowhole at the terminal portion of the inflow conduit, a control outflowspace which comes in contact with the outflow hole at the terminalportion of the outflow conduit and a flow rate control path which isconnected between the control inflow space and the control outflow spaceto control the flow rate of the flowed-in liquid chemicals; and acontrol support unit which is integrated with the housing and has theflow rate control unit so that the flow rate control unit is insertedand supported inside the control support unit and keeps hermeticitybetween the housing unit and the flow rate control unit itself, whereinthe flow rate control path has a controlled inner diameter and acontrolled length according to the flow rate a user aims at.

The housing unit can further include the insertion protrusion whichprotrudes from one side so that the housing unit is fastened to thecontrol unit, has the control space in which the control path of thecontrol unit is inserted and has the leak prevention groove on anotherside which assumes the shape of a groove and is inserted into thecontrol unit so that hermeticity is maintained.

The flow rate control unit can have a flow rate control frame inside theflow rate control unit along the outer circumference of the flow ratecontrol path so that hermeticity is maintained between the housing unitand the control support unit while the flow rate control path can bearranged so that the inflow hole and the outflow hole are connectedthereto and placed in a zigzag pattern so that the flow path having apredesigned diameter for the flowed-in liquid chemicals to flow at aprespecified flow rate is formed up to a predesigned length. Inside theflow rate control frame, the control inflow space to which the liquidchemicals flow in from the housing unit can be formed; the flow ratecontrol path is formed from the control inflow space via a controlinflow transport path in a zigzag way to control flow rates; and thecontrol outflow space is formed off which the liquid chemicals flow outto the housing unit from the flow rate control path via a controloutflow transport path.

The flow rate control device for supplying liquid chemicals can furtherinclude control inflow staining protuberances which protrude at aplurality of sites so that a plurality of control inflow passing pathsare formed inside the control inflow transport path at a predeterminedinterval and filter particles contained in the liquid chemicalstransported from the control inflow transport path in order to removethe particles.

The flow rate control device for supplying liquid chemicals can furtherinclude control outflow straining protuberances which protrude at aplurality of sites so that a plurality of control outflow passing pathsare formed inside the control outflow transport path at a predeterminedinterval and filter particles contained in the liquid chemicalstransported from the control outflow transport path in order to removethe particles.

In addition, the control support unit includes: a support frame which isintegrated with a housing frame and has a control insertion space insidewhich the flow rate control unit is inserted and kept hermetic and asupport insertion groove into which the insertion protrusion whichencircles the control insertion space is inserted; and a supportprotuberance which protrudes from the insertion protrusion to beinserted into the leak prevention groove inside the support frame.

The flow rate control device for supplying liquid chemicals according toan embodiment of the present disclosure provides advantageous effects ofminimizing the installation area by improving the structure ofcontrolling liquid chemical flow rates at the time of supplying suchliquid chemicals and minimizing obstruction by particles as foreignobject by extending the diameter of the flow path according to flow ratecontrols, thereby enhancing flow rate control efficiency.

The flow path for controlling liquid chemical flow rates of the flowrate control device for supplying liquid chemicals according to anembodiment of the present disclosure is formed in a zigzag pattern,which provides advantageous effects of minimizing particle obstructionin the liquid chemicals and minimizing an area according to transportdistance, thereby enhancing flow rate control efficiency.

In addition, the flow path of the flow rate control device for supplyingliquid chemicals according to an embodiment of the present disclosureprovides an advantageous effect of enhancing flow rate controlefficiency by minimizing particle obstruction because it supplies theliquid chemicals with such particles contained in it filtered out byhaving a plurality of protuberances for removing the particles at apredetermined interval.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an oblique view which describes the flow rate control devicefor supplying liquid chemicals according to an embodiment of the presentdisclosure.

FIG. 2 is a disassembled oblique view which describes the flow ratecontrol device for supplying liquid chemicals of FIG. 1.

FIG. 3 is a top view which describes the flow rate control device forsupplying liquid chemicals of FIG. 1.

FIG. 4 is a bottom view which describes the flow rate control device forsupplying liquid chemicals of FIG. 1.

FIG. 5 is a partial cross-sectional view which describes the flow ratecontrol device for supplying liquid chemicals of FIG. 1.

FIG. 6 is a disassembled oblique view which describes the flow ratecontrol device for supplying liquid chemicals according to anotherembodiment of the present disclosure.

FIG. 7 is a partial cross-sectional view which describes the flow ratecontrol device for supplying liquid chemicals of FIG. 6.

DETAILED DESCRIPTION

Since the present disclosure may have various modifications andembodiments, the present disclosure is now described below in detail inconnection with specific embodiments and accompanying drawings. However,it does not intend to limit the present disclosure to specificembodiments and must be acknowledged that the embodiments should includeall the modifications, equivalents and substitutes within the technicalthoughts and scope of the present disclosure. Reference numerals similarto each other are used to denote subject matters also similar to eachother in the accompanying drawings.

Terms such as first, second, A, B, etc. may be used to denote varioussubject matters but the subject matter must not be restricted by meansof the terms. Such terms are used in order only to differentiate asubject matter from other subject matters. For example, not deviatingfrom the claim scope of the present disclosure, a first subject mattermay be designated as second subject matter and vice versa. The term of“and/or” includes a certain item in two or more related and specifieditems or the combination thereof.

When it is stated that a certain subject matter is to denote varioussud” to another subject matter, it should be interpreted that the formermay be directly connected or linked to the latter but there may be astill another subject matter in between. On the contrary, when it isstated that a subject matter is “directly connected” or “directlylinked” to another subject matter, it should be interpreted that thereis not any third subject matter in between.

Terms used in this Specification are just to describe specificembodiments and are not intended to set limits to the presentdisclosure. A singular term includes plurality unless otherwiseindicated in another way contextually. The terms of“include/includes/including”, “have/has/having”, etc. must beinterpreted to state that there exist, as laid down in thisSpecification, feature(s), number(s), phase(s), movement(s),component(s) or part(s) or combination thereof and not to preliminarilyexclude any possibility of existence or addition of one or more of thosefeatures, number(s), phase(s), movement(s), component(s) or part(s) orcombination thereof.

Each of all the terms, including technical or scientific ones, used inthis Specification has a sense identical to what is generally understoodby a person skilled in the art of the present disclosure. Each of termssuch as ones defined in common dictionaries should be interpreted tohave a sense identical to what is contextually used in the relatedtechnology and, unless otherwise clearly defined in this Specification,is not to be interpreted in an ideal or excessively formal way.

Embodiments of the present disclosure will be described in more detailhereinafter with reference to the accompanying drawings.

FIG. 1 is an oblique view which describes the flow rate control devicefor supplying liquid chemicals according to an embodiment of the presentdisclosure; FIG. 2 is a disassembled oblique view which describes theflow rate control device for supplying liquid chemicals of FIG. 1; FIG.3 is a top view which describes the flow rate control device forsupplying liquid chemicals of FIG. 1; FIG. 4 is a bottom view whichdescribes the flow rate control device for supplying liquid chemicals ofFIG. 1; and FIG. 5 is a partial cross-sectional view which describes theflow rate control device for supplying liquid chemicals of FIG. 1.

Referring to FIGS. 1 through 5, the flow rate control device forsupplying liquid chemicals 100 according to an embodiment of the presentdisclosure is an apparatus which is connected between a storage forstoring liquid chemicals and a needle for injecting the liquid chemicalsinto the blood vessels of a patient and controls flow rates of theliquid chemicals so that supply quantities of the liquid chemicals areadjusted in order to treat diseases.

The flow rate control device for supplying liquid chemicals 100 includesthe housing unit 110 which transports the liquid chemicals with theirflow rates are controlled from their storage to the needle for injectingthem and the control unit 120.

The housing unit 110 includes the housing frame 111 which is installedto receive and leak the liquid chemicals, the insertion protrusion 114,the inflow conduit 117 and the outflow conduit 118.

The housing frame 111 is placed between the instrument for storing theliquid chemicals and needle for injecting the liquid chemicals at alocation where the housing frame can control flow rates of the liquidchemicals. The housing frame 111 has a width and a length identical tothose of the control unit 120 which is integrated with the housing frame111 to control flow rates of the liquid chemicals and is integrated withthe control unit 120 so that the liquid chemicals pass through theirinside.

The housing frame 111 has on one side the through-hole shaped inflowhole 112 which receives the liquid chemicals from the instrument forstoring the liquid chemicals and supplies the liquid chemicals to thecontrol unit 120 which controls the flow rates.

The housing frame 111 has on the other side has the outflow hole 113which is connected with the needle for injecting the liquid chemicals sothat the liquid chemicals whose flow rate is controlled through thecontrol unit 120 enter the needle.

The insertion protrusion protrudes for the control unit 120 of thehousing frame 111 to be inserted when it is integrated. The insertionprotrusion has the control space 115 within itself into which a flowrate-controlling part of the control unit 120 is inserted. The insertionprotrusion 114 has the leak prevention groove 116 on the side where thecontrol unit 120 is inserted in order to keep hermeticity when thecontrol unit 120 is inserted.

The inflow conduit 117 is placed on one side of one surface of thehousing frame 111 at the location where it is linked to the inflow hole112 to be connected with the liquid chemical storing instrument fromwhich the liquid chemicals are supplied so that the liquid chemicalsflow into the location at which the control unit 120 is placed.

The outflow conduit 118 is on the other side of the surface of thehousing frame 111 at the location where it is linked to the outflow hole113 and the liquid chemicals whose flow rates have been controlled inthe control unit 120 enter the needle.

The control unit 120 includes the control frame 121 which is placed onthe opposite surface of the housing frame 111 for controlling flow ratesand the leak prevention protuberances 123.

The control frame 121 is placed on the opposite surface of the housingframe 111 and has the control path 126 which is connected with theinflow conduit 117 and the outflow conduit 118 flowing the liquidchemicals through itself for controlling their flow rates. The controlpath 126 receives the liquid chemicals from the inflow conduit 117 andtransports them into the outflow conduit 118 making the liquid chemicalscontrolled in terms of their flow rates when they pass through thecontrol path 126. To form the control path 126, the flow path having apredetermined width is longitudinally stacked up a plurality of times ina zigzag pattern up to a certain length determined according to acontrolled flow rate, where both of the ends in the latitudinaldirection are connected alternately into a single flow path.

Within the control frame 121 is inserted the housing accepting groove122 into which the insertion protrusion 114 is inserted in order toprevent leak of the liquid chemicals.

The control path 126 is formed in a zigzag pattern and includes linearparts 126 a which assume the shape of a line and connecting curved parts126 b which are alternately connected to each other at the both ends.Here, a plurality of the linear parts 126 a are formed, which have apredetermined inner diameter and placed in a semicircular groove at apredetermined interval. A pair of the connecting curved parts 126 b areformed at the ends of the width of each of the linear parts 126 aalternately to construct a single path.

In the control path 126 formed in a zigzag pattern, one of the linearparts 126 a is connected with a pair of the connecting curved parts 126b to form a single path in order to control the flow rates, where thelinear parts 126 a are selected up to the very number for making apredetermined total length taking into consideration its inner diameter.

As described above, on one inner side of the control frame 121 is formedthe inflow space 124 which is a storage space for storing the liquidchemicals flowing in the location where the inflow hole 112 of thehousing frame 111 is. On the other side of the inflow space 124 isformed the inflow transport path 125 which assumes the shape of a flowpath in order to transport the flowed-in liquid chemicals to the controlpath 126.

In other words, the liquid chemicals stored in the instrument forstoring the liquid chemicals flow in through the inflow conduit 117 andthe inflow hole 112, are temporarily stored in the inflow space 124 andthen are transported to the control path 126 for controlling their flowrates through the inflow transport path 125 formed on the other side.

Here, within the inflow transport path 125 is formed the inflowstraining protuberances 125 a which protrude from the side that is inthe direction of the housing frame 111 at a predetermined interval inorder to form the inflow passing paths 125 b through which the liquidchemicals pass. The inflow straining protuberances 125 a are configuredso that the particles as foreign object in the liquid chemicals arefiltered by one of a plurality of the inflow passing paths 125 b andthat the rest of the particles are filtered by the rest of the inflowpassing paths 125 b when the liquid chemicals pass through the inflowpassing paths 125 b. The inflow straining protuberances 125 a areprovided in order to remove any particles which can be produced in theliquid chemicals temporarily stored in the inflow space 124.

In other words, the inflow straining protuberances 125 a protrudeforming a plurality of the inflow passing paths 125 b, the liquidchemicals are supplied with the particles contained in them removed ineach of the inflow passing paths 125 b, thereby limiting obstruction.

On the other side of the control path 126 is formed the outflowtransport path 127 through which the liquid chemicals whose flow ratehas been controlled are transported while on the other side of theoutflow transport path 127 is formed the outflow space 128, which islocated at the outflow hole 113 of the housing frame 111 and temporarilystores the liquid chemicals at the location where the liquid chemicalswhose flow rate has been controlled are leaked.

Here, the outflow transport path 127 has inside the outflow transportpath 127, on the side that is in the direction of the housing frame 111,the outflow straining protuberances 127 a at a plurality of sites at apredetermined interval so that the outflow transport path 127 has theoutflow passing path 127 b through which the liquid chemicals pass. Theoutflow straining protuberances 127 a are configured so that theparticles as foreign object contained in the liquid chemicalstransported from the outflow transport path 127 are filtered by one ofthe outflow passing paths 127 b and that the rest of the particles arefiltered by the rest of the outflow passing paths 127 b when the liquidchemicals are transported.

The leak prevention protuberance 123, being placed on one inner side ofthe control frame 121, protrudes within the housing accepting groove 122and is inserted into the leak prevention groove 116. The leak preventionprotuberance 123 is inserted into the leak prevention groove 116 whenthe control frame 121 is inserted in the housing frame 111, therebypreventing the liquid chemicals from being leaked outside.

FIG. 6 is a disassembled oblique view which describes the flow ratecontrol device for supplying liquid chemicals according to anotherembodiment of the present disclosure and FIG. 7 is a partialcross-sectional view which describes the flow rate control device forsupplying liquid chemicals of FIG. 6.

Referring now to FIGS. 6 and 7, the flow rate control device forsupplying liquid chemicals 100 according to another embodiment of thepresent disclosure includes the housing unit 110, the flow rate controlunit 130 and the control support unit 140. Since the housing unit 110 isidentical to that of the flow rate control device for supplying liquidchemicals 100 as described in FIGS. 1 through 5, description of it isomitted but the flow rate control unit 130 and the control support unit140, which differ, will be described.

The flow rate control unit 130 has the flow rate control frame 131 whichis placed on one side of the housing frame 111 so as to control flowrates.

The flow rate control frame 131 is placed on one side of the housingframe 111 and has the flow rate control path 134 which is connected tothe inflow conduit 117 and the outflow conduit 118 to control flow rateswhen the liquid chemicals pass through the flow rate control path 134.The liquid chemicals transported from the inflow conduit 117 arecontrolled in terms of their flow rates when they pass through the flowrate control path 134 and discharge into the outflow conduit 118. Toform the flow rate control path 134, the flow path having apredetermined width is longitudinally stacked up a plurality of times ina zigzag pattern up to a certain length determined according to acontrolled flow rate, where both of the ends in the latitudinaldirection are connected alternately into a single flow path.

The flow rate control frame 131 is inserted into the control supportunit 140 and controls flow rates of the liquid chemicals when thehousing frame 111 and the control support unit 140 is integrated formaintaining hermeticity.

The flow rate control path 134 is formed in a zigzag pattern andincludes control linear parts 134 a which assume the shape of a line andcontrol connecting curved parts 134 b which are alternately connected toeach other at the both ends. Here, a plurality of the control linearparts 134 a are formed, which have a predetermined inner diameter andplaced in a semicircular groove at a predetermined interval. A pair ofthe control connecting curved parts 134 b are formed at the ends of thewidth of each of the control linear parts 134 a alternately to constructa single path.

In the flow rate control path 134 formed in a zigzag pattern, one of thecontrol linear parts 134 a is connected with a pair of the controlconnecting curved parts 134 b to form a single path in order to controlthe flow rates, where the control linear parts 134 a are selected up tothe very number for making a predetermined total length taking intoconsideration its inner diameter.

As described above, on one inner side of the flow rate control frame 131is formed the control inflow space 132 which is a storage space forstoring the liquid chemicals flowing in the location where the inflowhole 112 of the housing frame 111 is. On the other side of the controlinflow space 132 is formed the control inflow transport path 133 whichassumes the shape of a flow path in order to transport the flowed-inliquid chemicals to the flow rate control path 134.

In other words, the liquid chemicals stored in the instrument forstoring the liquid chemicals flow in through the inflow conduit 117 andthe inflow hole 112, are temporarily stored in the inflow space 124 andthen are transported to the flow rate control path 134 for controllingtheir flow rates through the control inflow transport path 133 formed onthe other side.

Here, within the control inflow transport path 133 is formed the controlinflow straining protuberances 133 a which protrude from the side thatis in the direction of the housing frame 111 at a predetermined intervalin order to form the control inflow passing paths 133 b through whichthe liquid chemicals pass. The control inflow straining protuberances133 a are configured so that the particles as foreign object in theliquid chemicals are filtered by one of a plurality of the controlinflow passing paths 133 b and that the rest of the particles arefiltered by the rest of the control inflow passing paths 133 b when theliquid chemicals pass through the control inflow passing paths 133 b.The control inflow straining protuberances 133 a are provided in orderto remove any particles which can be produced in the liquid chemicalstemporarily stored in the control inflow space 132.

In other words, the control inflow straining protuberances 133 aprotrude forming a plurality of the control inflow passing paths 133 b,the liquid chemicals are supplied with the particles contained in themremoved in each of the control inflow passing paths 133 b, therebylimiting obstruction.

On the other side of the flow rate control path 134 is formed thecontrol outflow transport path 135 through which the liquid chemicalswhose flow rate has been controlled are transported while on the otherside of the control outflow transport path 135 is formed the controloutflow space 136, which is located at the outflow hole 113 of thehousing frame 111 and temporarily stores the liquid chemicals at thelocation where the liquid chemicals whose flow rate has been controlledare leaked.

Here, the control outflow transport path 135 has inside the controloutflow transport path 135, on the side that is in the direction of thehousing frame 111, the control outflow straining protuberances 135 a ata plurality of sites at a predetermined interval so that the controloutflow transport path 135 has the control outflow passing path 135 bthrough which the liquid chemicals pass. The control outflow strainingprotuberances 135 a are configured so that the particles as foreignobject contained in the liquid chemicals transported from the controloutflow transport path 135 are filtered by one of the control outflowpassing paths 135 b and that the rest of the particles are filtered bythe rest of the control outflow passing paths 135 b when the liquidchemicals are transported.

The control support unit 140 is placed on the opposite side of thehousing frame 111 and includes the support frame 141 and the supportprotuberance 144, which are combined so that the control support unit140 maintains hermeticity when the control support unit 140 has the flowrate control unit 130 within itself.

The support frame 141 is deployed on the other side of the housing frame111 and combined with the other side of the housing frame 111 formaintaining hermeticity inside them. Inside the support frame 141 isformed the control insertion space 142 into which the flow rate controlframe 131 is inserted for maintaining hermeticity.

In addition, the support insertion groove 143, into which the insertionprotrusion is inserted, is formed along the outer circumference of thecontrol insertion space 142 with a predetermined clearance in thesupport frame 141 as if the support insertion groove 143 encircles thecontrol insertion space 142.

Hermeticity is enhanced by inserting the insertion protrusion 114 intothe support insertion groove 143 with the control insertion space 142inserted inside the flow rate control frame 131 when the support frame141 is combined with the housing frame 111.

The support protuberance 144 protrudes towards one side inside thesupport frame 141 to be inserted into the leak prevention groove 116,which is formed on the other side of the insertion protrusion 114 to beinserted into the support insertion groove 143 in order to prevent theliquid chemicals from being leaked outside when the housing frame 111 isinserted to be combined.

The present disclosure has been described so far with reference toembodiments of the present invention. A person skilled in the art mayacknowledge that the present invention may be achieved into variousmodifications within the basic features of the present invention.Therefore, the embodiments so far disclosed must be consideredexplicative, not definitive. The scope of the present invention is clearin the scope of Claims, not in the description that has been so farstated and all the differences within the scope of the equivalents mustbe interpreted to be included in the present disclosure.

What is claimed is:
 1. A flow rate control device for supplying liquidchemicals comprising: a housing unit configured to be placed at alocation from which liquid chemicals are supplied, wherein the housingunit comprises an inflow conduit through which the liquid chemicals canflow in and an outflow conduit through which the flowed-in liquidchemicals can flow out; a control unit which is integrated with thehousing unit, wherein the control unit comprises an inflow space influid communication with an inflow hole of the inflow conduit, anoutflow space in fluid communication with an outflow hole of the outflowconduit and a control path in fluid communication between the inflowspace and the outflow space and configured to transport the flowed-inliquid chemicals from the inflow space to the outflow space with acontrolled flow rate, wherein the control path has a controlled innerdiameter and a controlled length according to the flow rate a user aimsat; and an outflow transport path in fluid communication between thecontrol path and the outflow space, through which the liquid chemicalswhose flow rate has been controlled are transportable, wherein theoutflow transport path includes a plurality of outflow strainingprotuberances facing towards the housing unit and arranged at aplurality of sites at a predetermined interval within the outflowtransport path to define therebetween outflow passing paths throughwhich the liquid chemicals are transportable, wherein the outflowstraining protuberances are configured so that particles contained inthe liquid chemicals transported from the control path are filtered outfrom the liquid chemicals when the liquid chemicals are transported outof the outflow transport path, and wherein the predetermined intervalextends along a first direction, wherein a width of the outflowtransport path between the control path and the outflow space along thefirst direction is constant and is less than a maximum width of theoutflow space along the first direction.
 2. The flow rate control devicefor supplying liquid chemicals of claim 1, wherein the housing unitfurther comprises an insertion protrusion which protrudes from one sideso that the housing unit can be integrated with the control unit, has acontrol space in which the control path of the control unit isinsertable and has a leak prevention groove that is insertable into thecontrol unit so that hermeticity is maintained.
 3. The flow rate controldevice for supplying liquid chemicals of claim 1, wherein the controlunit comprises: a control frame having a housing accepting groove alongan outer circumference around the control path and into which aprotruding portion of the housing unit is insertable so that the controlunit can be integrated with the housing unit and so that the liquidchemicals supplied via the control path can be prevented from beingleaked; and a leak prevention protuberance which protrudes from insidethe housing accepting groove and is insertable into the housing unit inorder to prevent the liquid chemicals through the control path frombeing leaked outside.
 4. The flow rate control device for supplyingliquid chemicals of claim 3, wherein the control path has a zigzagpattern so that a flow path having a predesigned diameter for theflowed-in liquid chemicals to flow at a prespecified flow rate is formedup to a predesigned length.
 5. The flow rate control device forsupplying liquid chemicals of claim 3, wherein, inside the controlframe: the inflow space, to which the liquid chemicals flow in from thehousing unit, is formed; the control path is formed from the inflowspace via an inflow transport path in a zigzag way to control flowrates; and the outflow space, off which the liquid chemicals flow out tothe housing unit, is formed from the outflow transport path.
 6. The flowrate control device for supplying liquid chemicals of claim 5, furthercomprising a plurality of inflow straining protuberances which protrudeat a plurality of sites to define a plurality of inflow passing pathsinside the inflow transport path at a predetermined interval, whereinthe inflow straining protuberances are configured so that particlescontained in the liquid chemicals transported from the inflow space arefiltered out from the liquid chemicals when the liquid chemicals aretransported out of the inflow transport path.
 7. A flow rate controldevice for supplying liquid chemicals comprising: a housing unitconfigured to be placed at a location from which liquid chemicals aresupplied, wherein the housing unit comprises an inflow conduit throughwhich the liquid chemicals can flow in and an outflow conduit throughwhich the flowed-in liquid chemicals can flow out; a flow rate controlunit which is, wherein the flow rate control unit comprises a controlinflow space in fluid communication with an inflow hole of the inflowconduit, a control outflow space in fluid communication with an outflowhole of the outflow conduit and a flow rate control path in fluidcommunication between the control inflow space and the control outflowspace and configured to transport the flowed-in liquid chemicals fromthe control inflow space to the control outflow space with a controlledflow rate, wherein the flow rate control path has a controlled innerdiameter and a controlled length according to the flow rate a user aimsat; a control support unit configured support the flow rate control unitand be integrated with the housing to keep hermeticity between thehousing unit and the flow rate control unit; and a control outflowtransport path in fluid communication between the flow rate control pathand the control outflow space, through which the liquid chemicals whoseflow rate has been controlled are transportable, wherein the controloutflow transport path includes a plurality of control outflow strainingprotuberances facing towards the housing unit and arranged at aplurality of sites at a predetermined interval within the controloutflow transport path to define therebetween control outflow passingpaths through which the liquid chemicals are transportable, wherein thecontrol outflow straining protuberances are configured so that particlescontained in the liquid chemicals transported from the flow rate controlpath are filtered out from the liquid chemicals when the liquidchemicals are transported out of the control outflow transport path,wherein the predetermined interval extends along a first direction,wherein a width of the control outflow transport path between the flowrate control path and the control outflow space along the firstdirection is constant and is less than a maximum width of the controloutflow space along the first direction.
 8. The flow rate control devicefor supplying liquid chemicals of claim 7, wherein the housing unitfurther comprises an insertion protrusion which protrudes from one sideso that the housing unit can be integrated with the control supportunit, has a control space in which the flow rate control path of thecontrol support unit is insertable and has a leak prevention groove thatis insertable into the flow rate control unit so that hermeticity ismaintained.
 9. The flow rate control device for supplying liquidchemicals of claim 8, wherein the control support unit comprises: asupport frame which is integrated with a housing frame and has a controlinsertion space inside which the flow rate control unit is insertableand kept hermetic and a support insertion groove into which theinsertion protrusion which encircles the control insertion space isinsertable; and a support protuberance which protrudes from theinsertion protrusion, wherein the support protuberance is insertableinto the leak prevention groove inside the support frame.
 10. The flowrate control device for supplying liquid chemicals of claim 7, whereinthe flow rate control unit has a flow rate control frame along an outercircumference of the flow rate control path so that hermeticity ismaintained between the housing unit and the control support unit, andwherein the flow rate control path has a zigzag pattern so that a flowpath having a predesigned diameter for the flowed-in liquid chemicals toflow at a prespecified flow rate is formed up to a predesigned length.11. The flow rate control device for supplying liquid chemicals of claim10, wherein, inside the flow rate control frame: the control inflowspace, to which the liquid chemicals flow in from the housing unit, isformed; the flow rate control path is formed from the control inflowspace via a control inflow transport path in a zigzag way to controlflow rates; and the control outflow space, off which the liquidchemicals flow out to the housing unit, is formed from the controloutflow transport path.
 12. The flow rate control device for supplyingliquid chemicals of claim 11, further comprising a plurality of controlinflow straining protuberances which protrude at a plurality of sites todefine a plurality of control inflow passing paths inside the controlinflow transport path at a predetermined interval, wherein the controlinflow straining protuberances are configured so that particlescontained in the liquid chemicals transported from the control inflowspace are filtered out from the liquid chemicals when the liquidchemicals are transported out of the control inflow transport path.